Collision jams traffic on Sir Francis Drake Boulevard near high school

A collision near the entrance to Sir Francis Drake High School in San Anselmo sent one person to the hospital Monday morning and blocked eastbound traffic for an hour.

Traffic was detoured to Center Boulevard, clogging the commute.

A westbound sedan trying to pull into the high school parking lot at about 8 a.m. collided with a pickup truck heading east, shaking up three people and sending one to Marin General Hospital with minor injuries, according to Joanne Lewis, county Fire Department spokeswoman.

Traffic was blocked westbound on Drake boulevard, triggering detours that jammed traffic for more than an hour.